Part Number 253427
ROAD CRANKSET OWNER'S MANUAL
Figure 1- Bontrager road crankset
Table of contents
Read this manual before you ride
Check compatibility before installing
Inspect your crankset regularly
Installation instructions
2
2
2
3
4
Bontrager warranty
Please read all of the supplied instructions thoroughly before using your new
crankset; the manuals contain important safety and maintenance information.
If you do not understand the information in this manual, or you have a
question about your crankset that this manual does not cover, consult your
Bontrager dealer. If you have a question or problem that your Bontrager dealer
can’t handle, contact us at:
Bontrager Components
Attn: Customer Service
801 W. Madison Street
920.478.4678
Waterloo, Wisconsin 53594
© Copyright Trek Bicycle Corporation 2004
All rights reserved
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These instructions explain the steps to remove an existing crankset and
install a new one. The correct installation of your crankset is critical to your
safety, so this work should be performed only by an experienced mechanic. If
you are not sure of your ability to correctly install this crankset and adjust the
parts, have the crank installed by your Bontrager dealer.
Check all parts' compatibility before installing
The crankset interfaces with the pedals, bottom bracket, chain, and front
derailleur with its shifter. Each of these parts must be compatible with the
crankset for the systems of a bicycle to function correctly. If you are not sure if
this crankset is compatible with your bicycle, consult your dealer.
Pedal removal and installation
To remove the pedals
Note: There are right and left pedals, usually marked with a letter stamped on the
end of the pedal axle, or on the wrench flats.
1. Turn the right pedal spindle counter-clockwise to remove the right pedal, the
opposite direction of tightening (Figure 3).
2. Turn the left pedal axle clockwise to remove the pedal.
To install the pedals
1. Apply a light coat of Wrench Force® synthetic grease or a similar lubricant
over all the threads.
See your dealer for a recommended grease.
2. Place the pedal washer over the pedal threads.
3. Thread the pedal into the crank arm by hand.
4. Follow the instructions for tightening pedals in Inspect your crankset
regularly
Crank arm removal and installation
The left crank arm is held in place by a crank bolt (Figure 2).
To remove a crankarm
1. Loosen the crankarm bolt on the left crankarm.
2. Continue turning the crank bolt to remove the crank arm.
To install a crankarm
With a self-extracting bolt, the parts must be correctly assembled
Extractor c
(Figure 6).
1. Apply a light coat of Wrench Force® synthetic grease or
a similar lubricant over all the threads, and the bottom
bracket axle splines.
See your dealer for a recommended grease.
2. Align the splines of the axle with the crank arm, and slide the
arm onto the axle.
Crank
bolt
When installing the crankarm, note the alignment of the opposite crank
arm.
3. Carefully engage the threads of the crank bolt.
4. Tighten as in Inspect your crankset regularly.
Figure 6- Self-extractor bolt
parts
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A conventional crankset is comprised of a left crankarm, right crankarm, and
bottom bracket. With the Bontrager Road crankset, the right crank arm and
bottom bracket are inseparable.
To remove a standard bottom bracket
1. Loosen the crankarm bolt on the left crankarm and remove the left crankarm.
2. Loosen the crankarm bolt on the right crankarm and remove the right
crankarm.
3. Using the proper tool, loosen and remove the left ("adjustable") bottom
bracket cup.
The left cup is right-hand threaded, and the right cup is left-hand (reverse) threaded.
3. Using the proper tool, loosen and remove the right ("fixed") bottom bracket
cup.
To install a Giga-Pipe bottom bracket
Make sure the frame's bottom bracket shell threads are clean and in good
condition. If necessary, chase and face the threads.
Grease all threaded surfaces, the bearing surfaces of the crank bolt, the
interfaces between the bearings and axle, the axle splines, and also the bearing
side of the seals.
1. Install the right bottom bracket cup, and tighten to 300-360 lb•in (34-41Nm).
2. Install the left bottom bracket cup, and tighten to 300-360 lb•in (34-41Nm).
3. Pass the bottom bracket axle through the right cup to the left cup.
4. Attach the left crankarm and tighten the crank bolt to 360-415 lb•in (41-47 Nm)
5. Check the left crankarm for play.
If there is play, remove both crankarms, grease the contact between the bottom
bracket axle and the bearings, and reinstall. It may require installing the cranks
several times to eliminate all play.
Bontrager Warranty
Trek Bicycle Corporation warrants each new Bontrager component against defects
in workmanship and materials for the a period of one year from the date of sale.
This warranty does not cover-
• Normal wear and tear
• Improper assembly
• Improper follow-up maintenance
• Installation of parts or accessories not originally intended for, or compatible
with, the wheels as sold
• Damage or failure due to accident, misuse, abuse, or neglect
• Labor charges for part replacement or changeover
This warranty is void in its entirety by any modification of the component or
its parts.
This warranty is expressly limited to the repair or replacement of a defective
item and is the sole remedy of the warranty. This warranty extends from the
date of purchase, applies only to the original owner, and is not transferable.
Trek is not responsible for incidental or consequential damages. Some states
do not allow the exclusion of incidental or consequential damages, so the above
exclusion may not apply to you.
Claims under this warranty must be made through an authorized dealer. Proof
of purchase is required.
This warranty gives the consumer specific legal rights, and those rights may
vary from place to place. This warranty does not affect the statutory rights of
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